<template>
  <el-breadcrumb class="app-breadcrumb" separator-icon="ArrowRight">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{
          item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
  import { useRouter, useRoute } from "vue-router"
  import { ref, watchEffect } from "vue"
  const route = useRoute();
  const router = useRouter();
  const levelList = ref([])

  function getBreadcrumb() {
    // only show routes with meta.title
    let matched = route.matched.filter(item => item.meta && item.meta.title);
    const first = matched[0]
    // 判断是否为首页
    // if (!isDashboard(first)) {
    //   matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched)
    // }

    levelList.value = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
  }
  function isDashboard(route) {
    const name = route && route.name
    if (!name) {
      return false
    }
    return name.trim() === 'Index'
  }
  function handleLink(item) {
    const { redirect, path } = item
    if (redirect) {
      router.push(redirect)
      return
    }
    router.push(path)
  }

  watchEffect(() => {
    // if you go to the redirect page, do not update the breadcrumbs
    if (route.path.startsWith('/redirect/')) {
      return
    }
    getBreadcrumb()
  })
  getBreadcrumb();
</script>

<style lang='scss' scoped>
  @use '@/styles/common' as *;

  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: $height;
    margin-left: 8px;

    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
</style>